docs(forms): add ng:change docs and other fixes

docs/content/cookbook/form.ngdoc

@@ -96,7 +96,7 @@ available in
   the {@link api/angular.scope scope} with the initial data.
 * For debugging purposes we have included a debug view of the model to better understand what
   is going on.
-* The {@link api/angular.widget.HTML input widgets} simply refer to the model and are auto bound.
+* The {@link api/angular.widget.input input widgets} simply refer to the model and are data-bound.
 * The inputs {@link guide/dev_guide.forms validate}. (Try leaving them blank or entering non digits
   in the zip field)
 * In your application you can simply read from or write to the model and the form will be updated.

docs/content/cookbook/helloworld.ngdoc

@@ -30,7 +30,7 @@
 Take a look through the source and note:
 
 * The script tag that {@link guide/dev_guide.bootstrap bootstraps} the angular environment.
-* The text {@link api/angular.widget.HTML input widget} which is bound to the greeting name text.
+* The text {@link api/angular.widget.input input widget} which is bound to the greeting name text.
 * No need for listener registration and event firing on change events.
 * The implicit presence of the `name` variable which is in the root {@link api/angular.scope scope}.
 * The double curly brace `{{markup}}`, which binds the name variable to the greeting text.

src/widget/input.js

@@ -20,6 +20,8 @@ var INTEGER_REGEXP = /^\s*(\-|\+)?\d+\s*$/;
  * @param {string=} ng:pattern Sets `PATTERN` validation error key if the value does not match the
  *    RegExp pattern expression. Expected value is `/regexp/` for inline patterns or `regexp` for
  *    patterns defined as scope expressions.
+ * @param {string=} ng:change Angular expression to be executed when input changes due to user
+ *    interaction with the input element.
  *
  * @example
     <doc:example>
@@ -150,6 +152,8 @@ angularInputType('email', function() {
  * @param {string=} ng:pattern Sets `PATTERN` validation error key if the value does not match the
  *    RegExp pattern expression. Expected value is `/regexp/` for inline patterns or `regexp` for
  *    patterns defined as scope expressions.
+ * @param {string=} ng:change Angular expression to be executed when input changes due to user
+ *    interaction with the input element.
  *
  * @example
     <doc:example>
@@ -217,6 +221,8 @@ angularInputType('url', function() {
  * @param {string=} ng:pattern Sets `PATTERN` validation error key if the value does not match the
  *    RegExp pattern expression. Expected value is `/regexp/` for inline patterns or `regexp` for
  *    patterns defined as scope expressions.
+ * @param {string=} ng:change Angular expression to be executed when input changes due to user
+ *    interaction with the input element.
  *
  * @example
     <doc:example>
@@ -290,6 +296,8 @@ angularInputType('list', function() {
  * @param {string=} ng:pattern Sets `PATTERN` validation error key if the value does not match the
  *    RegExp pattern expression. Expected value is `/regexp/` for inline patterns or `regexp` for
  *    patterns defined as scope expressions.
+ * @param {string=} ng:change Angular expression to be executed when input changes due to user
+ *    interaction with the input element.
  *
  * @example
     <doc:example>
@@ -354,6 +362,8 @@ angularInputType('number', numericRegexpInputType(NUMBER_REGEXP, 'NUMBER'));
  * @param {string=} ng:pattern Sets `PATTERN` validation error key if the value does not match the
  *    RegExp pattern expression. Expected value is `/regexp/` for inline patterns or `regexp` for
  *    patterns defined as scope expressions.
+ * @param {string=} ng:change Angular expression to be executed when input changes due to user
+ *    interaction with the input element.
  *
  * @example
     <doc:example>
@@ -413,6 +423,8 @@ angularInputType('integer', numericRegexpInputType(INTEGER_REGEXP, 'INTEGER'));
  * @param {string=} name Property name of the form under which the widgets is published.
  * @param {string=} true-value The value to which the expression should be set when selected.
  * @param {string=} false-value The value to which the expression should be set when not selected.
+ * @param {string=} ng:change Angular expression to be executed when input changes due to user
+ *    interaction with the input element.
  *
  * @example
     <doc:example>
@@ -480,11 +492,13 @@ angularInputType('checkbox', function(inputElement) {
  * @name angular.inputType.radio
  *
  * @description
- * HTML radio.
+ * HTML radio button.
  *
  * @param {string} ng:model Assignable angular expression to data-bind to.
  * @param {string} value The value to which the expression should be set when selected.
  * @param {string=} name Property name of the form under which the widgets is published.
+ * @param {string=} ng:change Angular expression to be executed when input changes due to user
+ *    interaction with the input element.
  *
  * @example
     <doc:example>
@@ -585,8 +599,8 @@ var HTML5_INPUTS_TYPES =  makeMap(
  * HTML input element widget with angular data-binding. Input widget follows HTML5 input types
  * and polyfills the HTML5 validation behavior for older browsers.
  *
- * The {@link angular.inputType custom angular.inputType}s provides a short hand for declaring new
- * inputs. This is a shart hand for text-box based inputs, and there is no need to go through the
+ * The {@link angular.inputType custom angular.inputType}s provide a shorthand for declaring new
+ * inputs. This is a sharthand for text-box based inputs, and there is no need to go through the
  * full {@link angular.service.$formFactory $formFactory} widget lifecycle.
  *
  *
@@ -599,6 +613,8 @@ var HTML5_INPUTS_TYPES =  makeMap(
  * @param {string=} ng:pattern Sets `PATTERN` validation error key if the value does not match the
  *    RegExp pattern expression. Expected value is `/regexp/` for inline patterns or `regexp` for
  *    patterns defined as scope expressions.
+ * @param {string=} ng:change Angular expression to be executed when input changes due to user
+ *    interaction with the input element.
  *
  * @example
     <doc:example>